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WYSIWYG mathematical text editor using TeX fonts

GNU TeXmacs is a free scientific text editor, which was both inspired
by TeX and GNU Emacs.

The editor allows you to write structured documents via a WYSIWYG
(what-you-see-is-what-you-get) and a user friendly interface. New
styles may be created by the user. The program implements
high-quality typesetting algorithms and TeX fonts, which help you to
produce professionally looking documents.

The high typesetting quality still goes through for automatically
generated formulas, which makes TeXmacs suitable as an interface for
computer algebra systems. TeXmacs also supports the Guile/Scheme
extension language, so that you may customize the interface and write
your own extensions to the editor.